George neffison



,UNITEDSTAWENTOFFIGE y i p ""GEQRGENEILSONQor BQSTONQMASSAGHUSETTS, AssIGNoR To HIMsELF AND 'NEHEMIAH HUNT.`

Y @CAST-WON PAVEMENT.

e Specification of Letters-Patent Il\Tc` .`12,'755,` dated April 17, 1855.

scribed; Figs. 5 and 6l exhibit a portion of fa vpavement laidl with blocks offthe'aid Mr-kinds .v x. y p

This blocli1I `consists of a cast ironbox` A,

i closed at top and openlat bottomandghaving `a perimeter of thirty square pieces,` a, ar-

` `rangedas shown in Fig.` '1,` and madebby similaryhexangular prismsldisposedfwith repect to each other as shown at b, b, &c., in

"thesaidfigurei d 1 l i This method ofmaking a block has anim- `partant advantage over a block Which is `formed by six heXangular` prisms `or hexagons c, c, c, disposed around .a central prism p or hexagon, d? `as seen 1n Flg. 4," for when the firstkind '0f bioks are laid together in a pavement,` each of them Where it abuts against anadjacent block Will be supported bya semi hexagonal projection .and a corresponding recessthe same forming a much better tie of the tWo blocks than results from combining blocks of the form shown in Fig. 4;. f

AI do notclaim a pavement block of a hexi agonal' form; norvvith a perimeter formed by six hexagons disposed around a common "or centralhexagon as shown in Fig-4, but What I do claim is Making a paving block With a perimeter of thirty faces arranged as shown in Fig. l,

fand formed by sixteen heXagons or hexag- "onal prisms disposed With respect to one another as therein represented-the same enabling such a block, Where it abuts against a contiguous block When laid in a pave-` ment., to be supported laterally by a semiheXagonal projection and recess as described. In testimony whereof, I have hereunto set my signature this twelfth day ofFebrw ary A. D. i855.

GEORGE NEiLsoN.

Witnesses:

FBAS. A. BRooKs, 

